Improvement in direct-acting steam-feed-works for circular-saw mills



new. armscom. l DIRECT ACTING vSTEAM FEED-WORKS FOR.GJIRCUI.AP4vSAW-MILLS..

'1\To.17%,004"4 Patented Feb. zz', '1876.7

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NPERAS, PHDTOvLITMOGRAPHER. WASHINGTON. D C4 UNIT-memes DE wrrr CLINTONrnnscorr,

PATENT Quema on MARINETTE, wisconsin.

IMPROVEMENI IN DlIiI-CTeACTING` STEAM-FEED-INORKS FOR CIRCULAR-SAWMILLS.

Specification forming part ol" Letters Patent' No. 174,064., datedFebruary 22, 1876; application filed November 13, 1875.

following specication, reference being hadto f the accompanyingdrawings.

lVly invention relates to that particular part of circular or rotary sawmills Ytermed the feed-works, by means of which the 10g (being supportedupon its carriage) is propelled or fed against the saw, and, also, isreturned or gigged back to itsorigiual position after a portion has beensawed from it, thus accomplishing, in conjunction with other mechanisms,the manufacture of lumber; and my object is to dispense with thecombination of belts, pulleys, shafts, frictions, and gearing which isnow in general use for that purpose, and also t0 obtain a more promptand efficient action of the log-carriage whenin operation.

The principle of my invention consists in applying the power of steamdirectly tothe log-carriage, and by this power, which I `cause to actinstantly and in a direct manner upon it,.to impart the reciprocatingmotion which it requires and the apparatus or mechanism I use for thispurpose is hereinafter described and shown.

In the accompanying plate of drawings,

"Figures 1, 2, and 3 show detail views of the mechanism, Figs. 4 and 5,its application in connection with the other parts of a circular orrotary saw mill of otherwise ordinary construction.

The construction oflmy apparatus is as follows:

In the drawing, Fig. l, in section, A designates a steam-cylinder, ofthe same length as the greatest run or travel of the log-carriage,proper allowance alsobeing made for i `clearance at each end, to preventthe piston lj from striking the cylinder-heads B and C,

which are fitted to it.

y D is a piston-head, constructed ina manner steamtight, and of suitableform. To this is attached one end of piston-rod E,whicl1 passes out ofcylinder A through the stufngbox in cylinder-head C, the other endthereof4 being attached` securely to the log-carriage by means ot thebrac'ketF, which is bolted to it at a suitable point to obtain a propertravel of the 'carri-age, and, at the same time, to secure acorresponding regular travel of the pistonhad D in cylinder A. The saidpiston-rodi E is composed of iron pipe, though steel pipe or `solid rodsmay be used.

Fig. 2 shows a sedional view of steam-chest' G, containing theslide-valve H, which operates upon a valve-seat in lower part ofsteamchest G, in which are steam-ports I and J and exhaust-port K.

The slide-valve H is so constructed that,

when placed upon the center of its stroke, it

will present eXliaust-openin gs to both of ports [and J. L and M aresteam-pipes leading from the openings of steam-ports I and J to eachcorresponding end of cylinder A. N is a pipe connected at opening-ofexhaust-port K to convey away exhausted steam. O is a valve stem or rodattached to slide-valve H, and also to lever P, with its fulcrum R,which, with connecting-rod S and hand-lever T, enables the sawyer tooperate the slide-valve H. (See plan of steam-chest, Fig. 3.) U is asteampipe leading from steam-chestlG to a boiler from which power issupplied, which it has not been deemed necessary to show. Portions ofsteam-cylinder A, piston-rod E, and steampipes L vand M are, removed,but they are supposed to be of proper length.

The operation of the machine is as follows: The cylinder A beingsecurely fastened to the mill-tloor or overlay-timbers, and thepiston-rod E attached t0 the log-carriage, the valve levers and rod P,T, and S are placed in position, as shown, and steam admitted throughsteam-pipe U into steam-chest G.

A log is placed upon the carriage when in position in front of the sawand somewhat to the let'tof the position shown in Fig. 4. Then, by meansof the hand-lever T, the slide-valve H is moved in the right directionto admit sufficient steam through steam-pipe L into the cylinder A toimpart motion to the log-carriage by means ot' the pistonhead D,piston-rod E, and bracket F.

In this manner the log (being upon the carriage in proper position) ispropelled or fed against the saw, which cuts off a slab, board,

or plank, as the case may be, as the log passes. This heiligaccomplished, the position of the hand-lever T is reversed, and with itthe slide-valve H, which exhausts the steam just employed, and admitslive steam into the cylinder A through steam-pipe M, by which thelog-carriage is forced or gigged back to its original position beforethe saw, ready for the next cut, the sawyer maintaining complete ployed,with one of which to operate the logcarriage in feedin g-the other torun or gig it back to its original position.

Having thus described` the principle and "construction as well as theoperation of myi invention, I will state what I claim andldesirel` tosecure by Letters Patent: 1

I claiml. The methodlof applying steam-power in` a direct manner tooperate log-carriages of circular or rotary saw lnills in the processof` sawing or manufacturing lumber, as specied.

2. The combination of the steam-cylinder A, with its heads B and C,pistou-head D, i piston-rod E, bracket F, steam-chest G, with l itsslide-valve H, stealn-ports I and J, and` exhal'ist-port K, steam-pipesL and M, exhaust? g pipe N, valve-stem 0, leverP, with its fulcrum Y R,connecting-rod S, hand-lever T,'and steampipe U, constructed andoperating together E as and for the purposes set forth.

DE WITT CLINTON PRESO/OTT.` Witnesses:

E. B. LEWIS, AMos HOLGATE.

